Across
1
Comparison of two quantities
3
System of ordered marks for measuring
5
Result of multiplication
7
Reference line in a graph
9
Total distance around a shape
10
Line touching circle at one point
12
Visual representation of data
Down
2
Value that does not change
4
The number representing nothing
6
Sum divided by count
7
Part of a circle's circumference
8
Single numeral from 0 to 9
11
Line crossing from corner to corner
13
Difference between highest and lowest values